Submarine warfare played a pivotal role in the Battle of the Atlantic as German U-boats targeted merchant ships and troop carriers from the US and other Allied nations. The underwater predators ...

Satellite imagery spotted a Chinese submarine with its nuclear ballistic missile hatches open while pier-side at a naval base with underground facilities facing the contested South China Sea.

A treasure trove of vital German intelligence, the submarine's capture was top-secret. See inside the U-boat, now a permanent exhibit at Chicago's Griffin Museum of Science and Industry. Submarine ...